One Conclusion on Relationship between Macro-Description and Micro-Description of Complex System

In general, a complex system can be described from point of microscopic or macroscopic view. The paper discusses the relationship between these two descriptions. The paper deduces condition that a certain functional relationship between different macro level variables could be obtained. The paper indicates that we could not apply micro level mechanics into macro level directly, and we need to check the results based on macro level variables, in particularly, we must rethink macro level relationship through data regression.